Running a different operating system on your computer provides users with a number of new possibilities, especially if you are not required to reboot your machine or leave Windows. You could use this facility to test a newer version of an existing operating system to see if it’s compatible with your current hardware, or to run an alternative OS, so you could run applications that are OS specific.
VMware Workstation 7.1 is desktop virtualisation software that enables people to run multiple operating systems, simultaneously, one a single machine. Not only can you run different Windows operating systems, you can use VMware workstation to host a Linux based operating system, too. This makes it incredibly useful for users looking to test an OS, before fully installing on a host machine. The latest v7.1 fully supports Windows 7.
VMware
Workstation 7.1 link.